Login failure RTC/3-tier setup

Business Central/NAV Technical Forum
1

I can’t get the RTC woking at one of our clients in a 3-tier setup. I followed all the steps in the walkthrough (creating SPN’s, configuring the delegation for the relevant users) but it looks like the kerberos authentication is not working.

When i look in the eventlog on the server running the Nav Service is see successfull loging using kerberos. The eventlog on the SQL machine shows a login attempt using NTLM.

Has anyone suggestions where to look next?

2

Are you sure that your clients network supports Kerberos? I had the exact same problem with a client a month ago and I had to change NAV from using TCPS to TCP, because their network didn’t support it. This was with NAV 4.0 SP3. Maybe it’s the same?

3

Well, it took some time, but i got it working.

There was a second spn with an incorrect server name. I missed that one, when i listed all spn’s for the Navision Application Server…